Datasheet ic

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Please Help Me ...... datasheet ic LA6508 & SP3727D

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Sorry, I may appear flippant, but go to Google, in search google merely type in the IC number LM6***** or SN*****
The Google reply is Pin out & Data sheet to the Ic you typed.
When I tried this I couldn't belive how easy it was, you even get links to purchase the component as well!
Melvyn
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The Dead PS2 LA6508/Laser Story
Background

Over the last 9 months we have heard lots of speculation as well as complete and utter rubbish as to why some of the PS2 version 9 and version 10 consoles die with LA6508/Laser failure.

This document is intended to put the matter straight.

The version 9 PS2 console was launched in the UK in October 2003. At that time the only chip available was the Messiah 2 PRO 1.31. With the Christmas build up and the ‘Limited Edition’ Satin Silver PS2 release, people were chipping like mad and the Messiah 2 team had record sales.
The Fault Emerges

Then around 2/3 weeks later people started complaining on the forums that their chipped consoles were dying. The most common symptom was that the console failed to boot any media and simply sat at the browser screen or came up with ‘disk read error’. Reports were coming in thick and fast from every forum direction.

Some people started to blame the Messiah 2 1.31, as most of the reports were coming in about chipped machines, and the Messiah was the only chip available at this time for the version 9 machines. This was also fuelled by a couple of people who had a grudge against the makers of the Messiah mod chip. The speculation went on and on. People came up with a number of different theories as to how the Messiah 2 1.31 could kill the consoles laser circuitry. A member of another well known mod chip producer then put his two penny in the pot and suggested that the Messiah was in fact corrupting the PS2’s laser calibration EEprom data. This was later proved to be complete rubbish!

At this point we had a small number of dead machines in our hands and set about trying to find out what the fault was with the consoles. We worked with a couple of people on the forums and found that all our dead machines had dead LA6508 chips.
Faulty PS2 Laser Coils

After some time the Ripper team released this document outlining that the fault was not the LA6508 chip itself but was in fact the laser coils. They said that this was totally due to badly manufactured laser coils. People started to test their laser coils and some people suggested soldering resistors in series to make up for the low resistance coils, which of course did not really work.

We set about investigating this claim and found that our dead console did in fact have a low resistance tracking coil.

We managed to get a picture of a coil under a 30X microscope. It was clear to us that the coil's enamel had in fact been heated to such an extent that the enamel had bubbled and melted.

Even though it was a step in the right direction we were not happy with the Ripper teams theory, as the consoles that suffered this death had both Sony and Sanyo lasers fitted. How could both companies produce faulty units at the same time when in fact they had both been producing lasers since the day the PS2 was released a number of years before? This really did not sit right in our minds!
Sanyo LA6508 Chips

People also started to say that it was a bad batch of LA6508 chips that caused the laser coils to get over heated.

We then managed to source the replacement Sanyo LA6508 and set about repairing all our dead consoles. By this stage we had a number of dead consoles with various modchips installed. All consoles were repaired with a new LA6508 and a new Sony laser unit. Unfortunately we saw three of these consoles come back to us a few weeks later, all three units had dead LA6508 and low resistance tracking coils!

This proved to us that the problem was neither the LA6508, laser or mod chip and is in fact an external factor to this circuit.
PS2 Romeo Mod

Around this time there was an interesting thread starting on a well known forum. This thread was talking about changing the 12volts power to the LA6508’s tracking circuit to 5volts. This indeed works very well and has become a mod named after the person that posted the fix ‘Romeo’.

We have been implementing this fix to every console we repair ever since and have not had one single problem since.
PS2 LA6508/Laser Conclusion

The problem only affected a very small percentage of the first version 9 and version 10 consoles released in the UK.

Since the beginning, we have seen a steady decline in the number of consoles with this problem with our main amount of units being from the very first batches of version 9 and version 10 consoles.

We believe that this problem is caused by some consoles having a slightly higher 12 volt line. This in turn causes the LA6508 to overdrive the laser tracking coil if dirty or cheap media played on the faulty units. Once the coil is overheated the LA6508 is almost always damaged.
Update: It has now come to light that ALL modchips have been crashing the mechacon (CD/DVD drive control chip) which in turn makes the LA6508 over drive the laser coils!

The Romeo mod works successfully because it drops the current going to the laser coils when the LA chips overdrives them.

Regards, Techy

Please note the views expressed in this document are the sole views of the author and does not in any way reflect the views of Dark Planets Ltd
How to measure the tracking coil



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